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For a spherical mirror of small aperture, the relation between radius of curvature R and focal length f is:

AR = 4f
BR = f/2
CR = f
DR = 2f
Answer & Solution
Correct answer: D. R = 2f
1. The focal point lies midway between pole and centre of curvature. 2. Hence the radius of curvature is twice the focal length. 3. Symbolically R = 2f. _Source: syllabus Science, Ch 9 "Light Reflection and Refraction", §9.2_
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